Control device for secondary clocks



P 17, 1929- A. L. DENNISTON ET AL 1,728,175

CONTROL DEVICE FOR SECONDARY CLOCKS Filed Sept. 18, 1924 2 Sheets-Sheet 1 P 1929- I A. L. DENNISTON El'AL 1,728,175

CONTROL DEVICE FOR SECONDARY CLOCKS Filed Sept. 18, 1924 2 Sheets-Sheet 2 5M @MA/ Patented 1 Sept. 17, 1929 UNITED STATES PATENT DFFICE ADOLPH L. DENNISTON AND ERNEST s. OSTLEB, OF CHICAGO, ILLINOIS, AssIaNoEs 'ro STROMBERG ELECTRIC comrm, or CHICAGO, rumors, A oonrom'rron or MAINE common DEVICE FQR sEcoNnlmY oLocxs Application filed September 18, 1924. Serial No. 738,349.

Our invention relates to control devices for secondary clocks.

One of the objects of our invention is to provide manually controlled pick-up mechanism for polarized secondary clock circuits,

whereby all the secondary clocks in the circuit may be simultaneously advanced as desired independently of the automatic control.

A further object of our invention is to provide manuall controlled pick-up mechanism which necessitates the disconnection of the automatic control before the manual control can be exercised.

Further objects will appear from the description and claims.

In the drawings, in which an embodiment of our invention is shown Figure 1 is a diagrammatic view showing the automatic and manual control for the polarized secondary clock circuits;

Fig. 2 is a section on the line 2-2 of Fig. 3, showing the pick-up switch and the cutout for the automatic control;

Fig. 3 is an end view of the construction shown. in Fig. 2; and Fig. 4 is a somewhat diagrammatic vie showing the pick-up mechanism and cut-out switch with the wiring connections.

Referring to the drawings in detail and first to the diagrammatic showing of Fig. 1,

this comprises a number of polarized secondary clocks 10, time-controlled means 11 for automatically reversing the current in the secondary clock circuit, manual means 12 for reversing the current in the secondary clock circuit when desired and a cut-out switch 13 for the automatic control interlocked with the manual control in such a way that it is necessary to cut out the automatic control from the secondary clock circuit before the manually-controlled mechanism can be used.

The automatic current reversing mechanism comprises connections 14 and 15 for the positive and negative side of the current '45 supply, a pair of contacts 16 and 19 connected with the positive side of the circuit, a pair of contacts 17 and 18 connected with the negative side of the circuit, a pair of conducting switch arms 20 and 21 connected together by an insulating member 22 and oscillatable back and forth together, a pair of contact po nts 23 and 24.- carried by the swinging switch arm 20, and movable into and out of engagement with respect to the contacts 16 and 17 respectively, a pair of contacts 25 and 26 mounted on the oscillatable switch' arm 21, and movable into and out of engagement with respect to the contacts 18 and 19, respectively, and a time-controlled periodically actuated cam 27 acting onthe oscillatable switch arms to move them back and forth periodically. This three-faced cam is periodically actuated through 120. It will be seen that each periodic actuation of this cam will cause a reversal of the current in the r conductors 28 and 29, since in one position of the switch the conductor 28 will be connected with the positive side of the circuit and the conductor 29 will be connected with the negative side of the circuit and in the other position of the switch the conductor 28 will be connected with the negative side of the circuit and the conductor 29 with the positive sideof the circuit. These conductors 28 and 29 are connected with the secondar $500k circuit through the double pole switch The manualv means for reversing the current in the secondary clock circuit comprises a pair of contacts 30 and 31 electrically connected with the positive and negative sides of the secondary clock circuits, respectively, through the conductors 32 and 33, a pair of contacts 34 and 35 electrically connected with the positive and negative sides of the supply circuit, respectively, through the conductors 36 and-37, and movable simultaneously into contact with the contacts 30 and 31, and a pair of contacts 38 and 39 connected with the negative and positive sides of the supply circuit respectively through the conductors 40 and 41 respectively/ and movable simultaneously into engagement with the cont-acts 30 and 31.

Means are provided as hereinafter described for preventing either pf the two pairs of contacts 34, 35, 38 and 39 from coming into engagement with the contact-s 30 and 31 when the double pole switch 13 is in closed position to connect the secondary clock circuit with the 100 automatic control. Means are also provided as hereinafter described to prevent one pair I of contacts 34, 35 from,engaging the fixed contacts 30, 31 when the other pair of contacts 38, 39 is in engagement therewith. This construction is shown in detail in Figs. 2, 3 and 4. As shown therein, the two pairs of conmember 42 is provided, one end of which engages an insulating equalizer bar 43, which is carried by the pair of spring contacts 34, 35,

and the other end of which engages another insulating equalizer bar 44 which is carried by the other pair of spring contacts 38, 39.

- When this rock lever is rocked in one direction the pair ofspring contacts 34 and 35 will i be pressed into engagement with the fixed contact plates and when it is rocked in the other directionthe' other pair of spring contacts 38, 39-will be depressed into engagement with the fixed contacts. It will be noted that the equalizer arrangement insures that both contacts of the pair operated will engage the fixed contacts, since even if one should make contact before the other a further movement of the rock lever would cause a slight tilting of the insulating equalizerbar to bring the other spring contact down into engagement.

The double pole switch for cutting out the automatic control comprises a pair of switch arms 45, 46 of conducting material pivoted on a pair of brackets 47 and 48, respectively, connected with the positive and negative side of the secondary clock circuit, respectively, a

pair of bent contact members 49, 50 with which the switch blades 45 and 46 cooperate respectively, an insulating bar 51 connecting the switch blades, and an operating button 52.

The interlock between the cut-out switch and the manually operated pick-up heretofore referred to comprises a plate 53 secured to the insulating cross bar 51, and having an aperture 54 which receives the curved operating arm 55 of the oscillatable rock arm 42 when the cut-out switch is closed, as indicated in Figs. 2 and 3. When the cut-out switch is moved from the open position shown in Fig. 2 to the closed position shown in Fig. 3, the aperture 54 in the plate receives the curved portion 55 of the rock lever and since the curved portion of this rock lever fits snugly in the aperture it is impossible to move this rock lever when the cut-out switch is closed.

. If it were not for this construction, which necessitates the disconnection of the automatic control before the manual control may be exercised, there would be danger of shortcircuiting the secondary clock circuit and burning'out the fuses as this would result if the automatic control and the manual control .be simultaneously advanced simply b openshould be so positioned as to connect the ositi ve supply line of the automatic contro dev1ce wit the negative supply line of the manually controlled device.

In use, if for any reason the seconda clocks should get out of time, they may al ing the cut-out switch 13 and rocking the rock lever 42 back and forth. Rockingthe rock lever back and forth causes the current to be reversed in the secondary clock circuit and thus has the same effect on the seconda clock mechanism as the automatic reversal e fected by the automatic control mechanism.

When the clocks have beenadvanced so as toshow the proper time, the cut-out switch is closed and the automatic control is resumed.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent of the United States is 1. The combinationwith a polarized secondaryclock, a circuit therefor, and a timecontrolled means for periodically reversing the current in said circuit to cause a corresponding periodic step-by-step movement of the secondary clock, of manually operable means for reversing the current in said circuit independently of said automatic means to cause step-by-step movement of the clock,

by said automatic and manual means.

2. The combination with a polarized sec ondary clock, a circuit therefor, and a timecontrolled means for periodically reversing the current in said circuit to cause a corresponding periodic step-by-step movement of the secondary clock, of manually operable means for reversing the current in said circuit independently of said automatic means to cause step-byrstep movement of the clock, and means for preventing concurrent control by said automatic and manual means, comprising a switch in the automatic control circuit, and means for preventing operationof the manual means when said switch is closed.

3. The combination with a polarized secondary clock, a circuit therefor, and a timecontrolled means for periodically reversing the current in said circuit to cause a corresponding periodic step-by-step movement of the secondary clock, of manually operable means for-reversing the current in said circuit "and means for preventing concurrent control independently of said automatic means to cause step-by-step movement of the clock, said manually operable means comprisin a switch movable from one position to anot er for reversing the current, and means for preventing concurrent control by said automatic and manual means comprising a switch in the automatic control circuit, and means for preventing operation of the manual switch when the switch in the automatic control circuit is closed.

4. The combination with a polarized secondary clock, a circuit therefor, and a timecontrolled means for periodlcally reversing the current 111 said circult to cause a corresponding periodic step-by-step movement of the secondary clock, of manually operable means for reversing the current in said circuit independently of said automatic means to cause step-by-step movement of the clock, said manuall operable means comprising a switch mova le from one position to another for reversing the current, said switch having two contacts permanently connected with the secondary clock circuit and two pairs of contacts permanently connected with the supply circuit, and means for movin said pairs alternately into engagement wit said two contacts respectively, said movin means comprising a pair of equalizers, one or each pair of contacts, and a rock lever acting on said equalizers, and means for preventing concurrent control of said automatic and manual means comprising a switch in the automa ic control circuit and means carried by the s witch in the automatic control circuit for hol in said rock lever in intermediate position w en the switch in the automatic control circuit is closed.

In witness whereof, we have hereunto subscribed our names. I

ADOLPH L. DENNISTON. ERNEST S. OSTLER. 

